Contains CInt equivalents of the #defines in the oci library headers.
This is not a complete set; just enough to get the Haskell libraries working.
This also might not be particularly portable, but I don't think Oracle are going
to change these in a hurry (that would break compiled programs, wouldn't it?).

Transaction types; parameters for ociTransStart.

Found in $ORAHOME/oci/include/oci.h.
There are more than this, but they're related to complicated
transaction-management stuff in the OCI libraries that I don't understand.
These should be sufficient to support the simple transaction model
understood by most developers.